In a small pot, bring the water to boil.
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Once the water has boiled, turn off the heat. Add the hibiscus flowers and steep for 10 minutes, then strain the hibiscus flowers from the (now magenta!) water:
Set the colored water aside in a separate bowl.
Using the paddle attachment of freestanding electric mixer (or, use a handheld whisk), beat the cream cheese and butter until smooth.
Add the powdered sugar and salt to this cream cheese/butter mixture a few tablespoons at a time.
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Drizzle in the hibiscus water, and continue beating until the color is uniform throughout the frosting.